Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – Solid – shaped macroscopic article or structure
Reexamination Certificate
1999-12-22
2002-06-25
Douyon, Lorna M. (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
Solid, shaped macroscopic article or structure
C510S224000, C510S294000, C510S298000, C510S299000, C510S300000, C510S446000
Reexamination Certificate
active
06410500
ABSTRACT:
This invention relates to detersive shaped bodies, primarily tablets, such as dishwasher tablets, laundry detergent tablets, bleach tablets, stain remover tablets or water softening tablets, for use in the home, more particularly for use in machines, to a process for their production and to their use.
Detersive shaped bodies, more particularly tablets, have a number of advantages over powder-form compositions, such as easy handling, simple dosage and low packaging volumes.
Unfortunately, problems arise out of the fact that, to achieve adequate dimensional stability and fracture resistance, relatively high pressures have to be applied in the compression of the powder-form ingredients. In view of the heavy compaction which they undergo, corresponding tablets often show inadequate storage stability in regard to sensitive ingredients (bleaching agent, perfume, enzymes, silver protectors, dyes, surfactants), reduced performance (particularly against such soils as tea, milk, starch) by comparison with comparable amounts of active ingredient made up in another form, occasionally inadequate protection of sensitive materials to be cleaned and impaired disintegration and dissolving properties in use.
According to some patents belonging to the prior art, some of these problems are said to have been solved.
In many cases, however, the consumer is unable to reproduce the performance advantages described in those documents. Accordingly, an important problem confronting manufacturers of detersive shaped bodies is to satisfy the consumer.
Accordingly, the problem addressed by the present invention was to provide high-performance, easy-to-handle detersive shaped bodies, above all dishwasher tablets, laundry detergent tablets, stain remover tablets or water softener tablets for use in the home, more particularly for use in machines, with high storage stability, minimal packaging volume, a good fragrance profile and a defined solubility profile which, above all, would guarantee high consumer satisfaction.
This problem has surprisingly been solved by a shaped body in which an ingredient (I) is mainly located in a defined region, this region representing no more than 40% by volume of the shaped body.
Accordingly, the present invention relates to a shaped body containing builders, alkali sources, bleaching agents, enzymes and surfactants, characterized in that more than 80% by weight of an active substance (I) containing a constituent from the group of soil-release compounds is present in a region of no greater than 40% by volume.
Besides the constituent from the group of soil-release compounds, the ingredient (I) may also be an oxygen- or chlorine-based bleaching agent, a bleach activator, a silver protector and/or a soil-release compound, an enzyme, a surfactant or a component or a compound for controlling solubility. However, the ingredient (I) may also be a mixture of these components.
In one particularly preferred embodiment, the ingredient (I) is a mixture of a component or a compound for controlling solubility besides the constituent from the group of soil-release compounds and at least one other ingredient from the group consisting of bleaching agent and/or bleach activator and/or silver protector and/or soil-release compound and/or enzyme and/or a surfactant.
The solubility of the region containing the ingredient (I), the surface, the nature of the compression and storage stability can also have a critical bearing on the properties of the tablet.
According to the invention, it is favorable if the region containing more than 80% by weight, preferably more than 90% by weight, more preferably more than 95% by weight and, most preferably, 100% by weight of an ingredient (I) present is surrounded in exactly three directions in space by other ingredients of the shaped body.
In another preferred embodiment of the invention, at least one region containing more than 80% by weight, preferably more than 90% by weight, more preferably more than 95% by weight and most preferably 100% by weight of an ingredient (I) present dissolves more than 5%, preferably more than 10%, more preferably more than 25%, most preferably more than 50% and, in one particularly advantageous embodiment, more than 100% faster than the remaining region and/or regions of the shaped body.
According to the invention, it is also positive if more than 80% by weight, preferably more than 90% by weight, more preferably more than 95% by weight and most preferably 100% by weight of an ingredient (I) present is contained in a region of no greater than 40% by volume, preferably between 5 and 30% by volume, more preferably between 10 and 25% by volume and most preferably between 15 and 20% by volume of the shaped body.
The overall result can also be desirably influenced if the increase in weight of the region with no more than 40% of the surface containing more than 80% by weight of an ingredient (I) during storage under normal domestic conditions, i.e. between 15 and 30° C. and between 5 and 55% and preferably between 15 and 35% air humidity for a period of 30 days, preferably 60 days and more preferably 90 days is no more than 50% by weight, preferably no more than 40% by weight, more preferably no more than 30% by weight, most preferably no more than 20% by weight and, in one particularly advantageous embodiment, no more than 10% by weight and, in the most favorable case, no more than 5% by weight.
The overall result can also be desirably influenced if the loss of active substance (I) of the region during storage under normal domestic conditions, i.e. between 15 and 30° C. and between 5 and 55% and preferably between 15 and 35% air humidity for a period of 30 days, preferably 60 days and more preferably 90 days is no more than 50% by weight, preferably no more than 40% by weight, more preferably no more than 30% by weight, most preferably no more than 20% by weight and, in one particularly advantageous embodiment, no more than 10% by weight and, in the most favorable case, no more than 5% by weight.
The overall result can also be desirably influenced if the absorption maximum of a 1% solution of a colored region or a colored component during storage under normal domestic conditions, i.e. between 15 and 30° C. and between 5 and 55% and preferably between 15 and 35% air humidity for a period of 30 days, preferably 60 days and more preferably 90 days is no more than 100 wave numbers, preferably no more than 50 wave numbers, more preferably no more than 30 wave numbers, most preferably no more than 20 wave numbers and, in one particularly advantageous embodiment, no more than 10 wave numbers and, in the most favorable case, no more than 5 wave numbers.
The shaped body according to the invention is also positively influenced if the region containing more than 80% by weight, preferably more than 90% by weight, more preferably more than 95% by weight and, most preferably, 100% by weight of an ingredient (I) present is surrounded in exactly three directions in space by other ingredients of the shaped body.
Solubility
The solubility can be influenced by components and/or compounds for accelerating solubility (disintegrators) or retarding solubility.
Suitable disintegrators are any of the disintegrators known from the prior art. Particular reference is made in this regard to
Römpp
(9
th Edition, Vol
. 6
, page
4440) and
Voigt “Lehrbuch der pharmazeutischen Technologie
” (6
th Edition
, 1987). Particularly suitable disintegrators are such materials as starch, cellulose and cellulose derivatives, alginates, dextrans, crosslinked polyvinyl pyrrolidones and others; systems of weak acids and carbonate-containing disintegrators, more particularly citric acid and tartaric acid in combination with hydrogen carbonate or carbonate and polyethylene glycol sorbitan fatty acid ester.
The use of disintegrators is also known from the patent literature. Thus, according to German patent application DE 938 566, acetyl salicylic acid is converted into granular form before compression, carefully but completely dried and then coated with highly disperse silica.
Beaujean Hans-Josef
Haerer Juergen
Moeller Thomas
Mueller-Kirschbaum Thomas
Nitsch Christian
Douyon Lorna M.
Henkel Kommanditgesellschaft auf Aktien
Murphy Glenn E.J.
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